CN1629948A - Objective lens driving device - Google Patents
Objective lens driving device Download PDFInfo
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- CN1629948A CN1629948A CNA2004100985211A CN200410098521A CN1629948A CN 1629948 A CN1629948 A CN 1629948A CN A2004100985211 A CNA2004100985211 A CN A2004100985211A CN 200410098521 A CN200410098521 A CN 200410098521A CN 1629948 A CN1629948 A CN 1629948A
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- coil
- objective lens
- objective
- lens device
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0933—Details of stationary parts
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
The invention provides an objective lens driving device capable of obtaining a small amount of an effective damper effect by arranging damper agents in proper positions in the actuator of the objective lens driving device of a symmetrical type equipped with a suspension wire, thereby contributing a cost reduction. The objective lens driving device 100 used for an optical pickup is provided with a damper base having an objective lens holder 20 for holding an objective lens 30, a suspension wire 1 on both sides of the holder 20 with each one end fixed to a first fixing part, second and third fixing parts 12 and 13 for supporting the other end side of the suspension wire 1. A distance between the second and third fixing parts 12 and 13 is set larger by 1/5 to 2/5 times than that between the first and third fixing parts, and a damper agent 3 is applied on the second fixing to flexibly support the suspension wire 1.
Description
Technical field
The present invention relates to be used for the objective lens device of CD drive, particularly the support structure of this objective carrier.
Background technology
CD drive be used for playback record on CD (CD, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD+R, DVD-RAM, DVD+RW, DVD-RW etc.) information or the device of writing information.This kind CD drive is in order to realize from the CD sense information or toward the CD writing information, is used for the CD irradiating laser and detects its catoptrical optical pickup and possess.
Usually, optical pickup have outgoing laser beam LASER Light Source, will penetrate the laser beam direction CD time with the optical system of guides reflected light photodetector.And, in this optical system, comprise object lens towards the CD configuration.
For will controlling the position of the used object lens of optical pickup accurately along the focal length direction of optical axis and along the trajectory direction of the radial direction of CD, so as with laser beam correctly optically focused on the cd-rom recording surface that is driven in rotation (track).In addition, recently, along with the raising of recording density, the necessity of the influence that elimination or the bending of inhibition CD cause strengthens, thereby has produced necessity of control object lens inclining.
Traditional objective lens device will support the objective carrier of fixture mirror with many hanging metal linear elasticity ground for the control of can focusing, tracking Control and the control of tilting.
In addition, on objective carrier, reel or focusing coil, tracking coil and tilt coil are installed, and make these coiler part ground be positioned at the gap of magnetic circuit.In such structure, the electric current that flows in each coil is controlled in traditional objective lens device utilization, can finely tune the position of object lens and inclination (with reference to Patent Document 1: the spy opens bulletin 2001-93177 number).
Figure 11 is the stereographic map of the disclosed objective lens device of Patent Document 2 (special hope 2003-111953 number).In addition, Figure 12 is the stereographic map of state of casting coping 57 of pulling down the objective lens device of Figure 11.
As Figure 11 and shown in Figure 12, objective lens device has: base 51, object lens 52, objective carrier 53, with respect to base 51 swingably stilt mirror holder 53 4 (only illustrating 2) hanging metal lines 54 and be fixed on a pair of yoke 55 on the base 51 and be fixed on magnet 56 on each yoke 55.
This objective lens device is installed on the optical mount of not shown CD drive, thereby constitutes optical pickup.Optical mount can be installed on the guide rod movably along the radial direction (tracking direction Tr) of the CD that is imported into optical disc apparatus.And, the optical system of laser diode, photodetector and regulation is installed on optical mount, be to be radiated on the CD by object lens 52 from laser diodes and with the structure of its guides reflected light photodetector.
As described later, on objective carrier 53, be wound with tilt coil, focusing coil and tracking coil, by suitably controlling the electric current that flows through in these coils, objective carrier 53 is based on the relation in the magnetic field that forms with yoke 55 and magnet 56, tilt to transfer (is that turning axle rotates with the axle parallel with tangential direction Tg) along tracking direction (Tr), and move or move along the direction (F) of focusing along tracking direction (Tr).
As shown in figure 13, upper side member 60 is roughly foursquare tabular (face towards lower side member 65 is roughly quadrilateral), and portion is formed with the through hole 61 that is used to install object lens in the central.In addition, near four jiaos of upper side member 60, be formed with four square openings 62 that are used to insert yoke 55 parts in the position of symmetry.And yoke 55 cross sections are U word shape, and one side comprises the excellent sheet of two vertical direction relatively.
On upper side member 60, also be formed with the fixed part 63 that is used for fixing hanging metal line 54 in tracking direction (Tr) both sides.And,, near its end, tangentially be formed with 4 the 1st hook portions 64 of the tracking coil that is used to reel highlightedly in tangential direction (Tg) both sides of upper side member 60.
On the other hand, as shown in figure 14, lower side member 65 have the plate-like portion 66 that is roughly square (face towards upper side member 60 is roughly quadrilateral), from this plate-like portion 66 one towards the outstanding tilt coil frame portion 67 of vertical direction.The size of plate-like portion 66 is identical with upper side member 60 in tangential direction (Tg) at least.
Central authorities at plate-like portion 66 are formed with the through hole 69 that is used for by laser.And, near four jiaos of plate-like portion 66, be formed with four square openings of a part that is used to insert yoke 55.Tilt coil frame portion 67 forms in the mode of the shape of incomplete this square opening of encirclement.
And then, on lower side member 65, in its tangential direction (Tg) both sides, and near its end, 4 the 2nd hook portions 68 of the tracking coil that tangentially is formed for highlightedly reeling.
Above-mentioned upper side member 60 and lower side member 65 are made up mutually and are constituted objective carrier 53, but before it was made up, tilt coil 70 and focusing coil 71 were wound onto in the tilt coil frame portion 67 in proper order by this.
As shown in figure 15, tilt coil 70 is wrapped in respectively in 4 tilt coil frame portions 67 successively.Then, focusing coil 71 as single volume core, is twined in 4 tilt coil frame portions 67 of these tilt coils that are wound 70.
Then, on lower side member 65, twine after tilt coil 70 and the focusing coil 71, upper side member 60 is fixed on the lower side member 65.
Under the state of this combination, these objective carrier 53 integral body are used as focusing coil frame portion, then the plate-like portion 66 of upper side member 60 and lower side member 65 is equivalent to flange.4 tilt coil frame portions 67 are equivalent to roll up core as mentioned above.
In addition, make the central shaft of the through hole 61 that is formed on upper side member 60 consistent with each other with the central shaft of the through hole 67 that is formed on lower side member 65.In addition, make 4 the 1st hook portions being formed on the upper side member 60 64 be formed on the lower side member 65 4 the 2nd hook portions 68 mutually in the face of and respectively in pairs.The 1st hook portion 64 and the 2nd hook portion 68 to being configured for twining 4 tracking coil frame portions of tracking coil respectively.
Afterwards, as shown in figure 15, in 4 tracking coil frame portions, twine tracking coil 72, and object lens 52 are installed as shown in Figure 16.
Figure 16 is illustrated in winding around 70,71 and 72, and has installed on the objective carrier 53 of hanging metal line 54, has made up the state of yoke 55 and magnet 56.In addition, magnet 56 is the magnetized magnet in the two poles of the earth.
The end of tilt coil 70, focusing coil 71 and tracking coil 72 is connected with splicing ear 81,82,83.At this moment, as shown in figure 16, on the splicing ear 81,82 of the end that has connected focusing coil 71 and tracking coil 72, also connecting an end that is fixed on the hanging metal line 54 on this fixed part 63 with the state that runs through the fixed part 63 that is formed on the upper side member 60 down respectively.On the other hand, as shown in figure 16, on the splicing ear that is connecting tilt coil 70, be connected with extension line 84.
As shown in figure 16, after extension line 84 runs through fixed part 63 and is fixed, be connected by bending downwards and with the tilt coil 70 usefulness splicing ears 83 of quilt setting on the lower side member 65 of objective carrier 53.
As can understanding easily, in the magnetic gap of the magnetic circuit that forms by yoke 55 and magnet 56, disposed the part of tilt coil 70, focusing coil 71 and tracking coil 72 respectively from Figure 16.Therefore, according to the electric current that flows in each coil, objective carrier 53 moves or tilts and move.That is, by the control to electric current mobile in each coil, control, focus control and tracking Control can tilt.
Usually, with regard to driver, fill damping agent,, just can not obtain suitable damping if utilize this method not use a large amount of damping agents in its one of hanging metal line.
Summary of the invention
At this, the object of the present invention is to provide a kind of objective lens device, on the driver of the symmetric form objective lens device that possesses the hanging metal line, utilize the effect that the damping agent configuration is obtained to obtain with a spot of damping agent in position effective damping, and therefore can reduce the cost.
Can obtain a kind of objective lens device (100) according to the present invention, above-mentioned objective lens device (100) has: the fixing objective carrier of object lens (20); Be located at the both sides of described objective carrier (20) and an end separately respectively and be fixed on hanging metal line (1) on the 1st fixed part (11); Leave and be provided with and have the damping base (10) of the 2nd and the 3rd fixed part (12,13) at another two distolateral places that support above-mentioned hanging metal line (1) along the 1st direction with above-mentioned objective carrier (20), it is characterized in that: the distance between the above-mentioned the 2nd and the 3rd fixed part (12,13) is 1/5～2/5 times of distance between the above-mentioned the 1st and the 3rd fixed part (11,13), and is provided with damping agent flexibly to support above-mentioned hanging metal line (1) on above-mentioned the 2nd fixed part (12).
In addition, can obtain a kind of objective lens device (100) according to the present invention, in the above-mentioned objective lens device (100), it is characterized in that: have the yoke base (23) that supports above-mentioned objective carrier (20) and above-mentioned damping base (10), above-mentioned objective carrier (20) has tilt coil (16) at 4 places, reel focusing coil (17) around it, be located at the tracking coil (14) on the both sides at two ends, the outside of this each coil respectively, at the 1st magnet (22) of each coil that has the above-mentioned objective carrier of the clamping of being configured to (20) on the above-mentioned yoke base (23) be configured in a pair of the 2nd magnet (21) between a pair of the 1st magnet (22) of above-mentioned both sides respectively.
In addition, can obtain a kind of objective lens device (100) according to the present invention, in the above-mentioned objective lens device (100), it is characterized in that: above-mentioned yoke base (23) has 4 the 1st yokes (25) that are configured in above-mentioned each coil, is configured in the tabular yoke iron (23a, 23b) at the two ends, above-mentioned the 1st direction outside of above-mentioned the 1st magnet (22) respectively.
In addition, can obtain a kind of objective lens device (100) according to the present invention, in the above-mentioned objective lens device (100), it is characterized in that: an end (2a) that bends to L word shape that is connected with lead-in wire (2) at the front end of above-mentioned tilt coil (16), wall portion is run through from being arranged near the cavity of above-mentioned object lens (20) in an above-mentioned end (1a), after the other end runs through and be fixed in the pickup groove (8a, 8b) of the substantial middle portion that is located at above-mentioned damping base (10), rearward outstanding.
In addition, the Reference numeral in the above-mentioned bracket only marks in order to understand the present invention easily, is not any restriction mark of the present invention.
Can provide a kind of objective lens device according to the present invention, in the driver of symmetric form objective lens device with hanging metal line, by damping agent is disposed in position, can suppress unnecessary resonance or non-standard gain and obtain effective damping, therefore can reduce cost with a spot of damping agent.
Description of drawings
Fig. 1 is the objective lens device stereographic map of the embodiment of the invention.
Fig. 2 is the front view of Fig. 1 objective lens device.
Fig. 3 is the rear view of Fig. 1 objective lens device, and its upper and lower relation is opposite with Fig. 2.
Fig. 4 is the vertical view of Fig. 1 objective lens device.
Fig. 5 is the right view of Fig. 1 objective lens device.
Fig. 6 is the left view of Fig. 1 objective lens device.
Fig. 7 is the upward view of Fig. 1 objective lens device.
Fig. 8 is the figure of the relation of frequency number on the presentation graphs 4 damping agents coatings position 1/10 and gain and phase place.
Fig. 9 is the figure of the relation of frequency number on the presentation graphs 4 damping agents coatings position 1/2 and gain and phase place.
Figure 10 is the figure of the relation of frequency number on the presentation graphs 4 damping agents coatings position 1/3 and gain and phase place.
Figure 11 is the stereographic map that utilizes the objective lens device of conventional art.
Figure 12 is the stereographic map of state that the objective lens device top cover of Figure 11 is taken off in expression.
Figure 13 is the stereographic map of the upper side member of the used objective carrier of expression Figure 12 objective lens device.
Figure 14 is the stereographic map of the lower side member of the used objective carrier of Figure 12 objective lens device.
Figure 15 is the lower side member combination of expression with upper side member and Figure 14 of Figure 13, and is provided with the stereographic map of tracking coil state.
Figure 16 is illustrated on the objective carrier of state shown in Figure 15 to install, object lens are set, and has made up the stereographic map of the magnetic circuit state that comprises yoke and magnet.
Symbol description
1-hanging metal line, 2-lead-in wire, 2a-one end, 3, the 4-damped part, the 5-fixed part, 7-pickup groove, 8a, the 8b-groove, 10-damping base, 11-connection terminal (the 1st fixed part), 12-the 2nd fixed part, 13-the 3rd fixed part, 14-tracking coil, the 16-tilt coil, 16a-front end, 17-focusing coil, 18-coil component, the 20-objective carrier, 21-the 2nd magnet, 22-the 1st magnet, 23-yoke base, 23a, 23b-the 1st yoke, 25-the 2nd yoke, 28-coil mounting hole, 29-hole, the 30-object lens, 31-object lens installation portion, 32-mounting hole, 35-cavity, the 36-fixed part, 51-base, 52-object lens, the 53-objective carrier, 54-hanging metal line, 55-yoke, 56-magnet, 57-casting coping, 60-upper side member, the 63-fixed part, 64-the 1st hook portion, 65-lower side member, the 66-plate-like portion, 67-tilt coil frame portion, 68-the 2nd hook portion, the 69-through hole, 70-tilt coil, 71-focusing coil, the 72-tracking coil, 81,82, the 83-connection terminal, the 100-objective lens device.
Embodiment
Below, with reference to the description of drawings embodiments of the invention.
Fig. 1 is the stereographic map of the objective lens device of the embodiment of the invention, and Fig. 2 is the front view of Fig. 1 objective lens device, and Fig. 3 is the rear view of Fig. 1 objective lens device, and its upper and lower relation is opposite with Fig. 2.In addition, Fig. 4 is the vertical view of Fig. 1 objective lens device, and Fig. 5 is the right view of Fig. 1 objective lens device, and Fig. 6 is the left view of Fig. 1 objective lens device, and Fig. 7 is the upward view of Fig. 1 objective lens device.
As Fig. 1～shown in Figure 7, objective lens device 100 has: damping base 10; Object lens 30; Objective carrier 20; With respect to damping base 10 1,1,1,1 and 2 on 4 hanging metal lines lead-in wire 2,2 of stilt mirror holder 20 swingingly; Loaded the yoke base 23 of damping base 10 and objective carrier 20; And be fixed on magnet 21,22 on the yoke base 23.
This objective lens device 100 is installed on the optical mount of the not shown CD drive that goes out, and constitutes optical pickup.Optical mount can be along the radial direction (tracking direction (below, be called the Tr direction) of the CD of the optical disc apparatus of packing into) be installed on the guide rod movably.And be constructed as follows: the optical system of laser diode, photodetector and regulation has been installed on optical mount, can have made from laser diodes to be radiated on the CD by object lens 30, and with this guides reflected light photodetector.
As the tangential direction of the 1st direction of damping base 10 (below, be called the Tg direction) both sides, form fixed part 12,13 respectively.And in the Tg direction central authorities near damping base 10, ground, Clamping Center has formed fixed part 5 in both sides, forms the pickup groove 9 that is separated from each other and bends to the S word shape from each fixed part 12,5, and extends through the outside along the extension of Tg direction always.The hanging metal line is supported and fixed on each fixed part.
On objective carrier 20, the coil component 18 that possesses the hollow shape that has tilt coil 16 and reeled its focusing coil 17 on every side, tracking coil 14, flow through these tilt coils 16 by suitably controlling, the electric current of focusing coil 17 and tracking coil 14, objective carrier 20 based on yoke 23a, 23b, 25 and magnet 21, the relation in 22 magnetic fields that form, to with the transfer (is that turning axle rotates with the axle parallel with the Tg direction) of tilting of the Tr direction of vertical conduct the 2nd direction of the 1st direction, and move along the Tr direction, or move along the focus direction of conduct the 3rd direction vertical (below, be called the F direction) with the 1st and the 2nd direction.
As on Fig. 7 best shown in like that, yoke base 23 has: connect the both sides be arranged on Tg direction central portion 2 places 4 tabular yoke irons (below, be called the 1st yoke) 25,25,25,25 and uprightly be located at the yoke of trapezoidal shape of tabular yoke iron (below, be called the 2nd yoke) 23b, the 23b leading section of Tg direction one end; And be arranged on 2 yoke 23a, 23a being provided with in both sides near the other end and broad ways (below, be also referred to as the 2nd yoke).
And, on yoke base 23, be provided with the 1st magnet 22,22, and respectively with the 2nd yoke 23a, when 23b contacts, have identical polar, have mutual opposite polarity at the 1st adjacent magnet 22 of Tr direction (Width) at the 1st magnet 22 of length direction homonymy.In addition, also be provided with the 2nd magnet 21,21 in central both sides, and make it have mutually opposite polarity at length direction.
On objective carrier 20, tilt coil 16 and focusing coil 17 are wound in not shown frame in proper order by this or reel with around the parts, the hollow shape coil component 16 that constitute the state of frame peripheral that is wound in, maybe coiling can be taken out with parts.So, tilt coil 16 is wound onto respectively on 4 not shown tilt coil framves in order.Then, around 4 tilt coils of these tilt coils 16 of reeling, coiling focusing coil 17 forms the state that is wound in frame or takes out 4 coil components 16 of state of the tube of frame, and it is inserted respectively in 4 coil mounting holes 28.
On objective carrier 20, also Tr direction two ends along about (F direction) side by side and as the 1st fixed part that is used for fixing lead-in wire 54 and form connection terminal 11.And, in the Tg of objective carrier 20 direction both sides, near its end, be provided with tangentially when protruding, 4 pairs of totals arranged side by side along the vertical direction not shown the 1st hook portion and the 2nd hook portion of 2 couple of tracking coil 14 that be used to reel respectively.Each paired up and down tracking coil 14 of having reeled on every side in the 1st hook portion and the 2nd hook portion forms 4 tracking coils of total.
Then, object lens 30 are installed on the object lens installation portion 31.
The end of focusing coil 17 and tracking coil 14 is connected with 4 connection terminals 11,11,11,11 at conduct the 1st fixed part of the upper and lower settings of the Tg of objective carrier 20 direction both sides.Here, on the connection terminal 11,11 that connects focusing coil 17 and tracking coil 14 ends, also connecting respectively from another distolateral the 2nd and the 3rd fixed part 12,13 that passes damping base 10 and with the state that runs through this connection terminal 11 and be fixed on a end as the hanging metal line 1 on the connection terminal 11 that is formed at fixed part on the objective carrier 20.
On the other hand, an end 2a leading section that bends to L word shape that on the front end 16a of tilt coil 16, is connecting the lead-in wire 2 that has the dip plane halfway.
One end 2a of lead-in wire 2 is bent to the L word shape upward, its front end runs through wall portion 5 and reaches in the cavity 35 of objective carrier 20, and drawn by the fixed parts 36 that are formed in this cavity 35, after its other end ran through the fixed part 5 of damping base 10 and bends to the pickup groove 7 of S word shape and be fixed, the fixed orifice 8 of the damping base 10 by possessing groove 8a, 8b was rearward outstanding.
On the other hand, the leading section 16a of tilt coil 16 arrives in the cavity by not shown groove.The front end 2a of lead-in wire 2 and the leading section 16a solder of tilt coil 16 are also fixed.What this lead-in wire 2 used is winding wire or braided wire (twisted wire).
In addition, filled damped part 4,3 respectively at the hanging metal line 1 of folding and unfolding fixed part 5,12 or 2 the position of going between.The configuration of tracking coil 14, tilt coil 16, focusing coil 17 and the 1st and the 2nd magnet 22,21 and the 1st and the 2nd yoke 25,23a and act on as described below.
As can easily understanding from Fig. 1～Fig. 7, in the magnetic gap of the 1st and the 2nd yoke 23a, the 23b of tangential direction, magnetic circuit that the 25 and the 1st and the 2nd magnet 22,21 combines, disposed the part of tilt coil 16, focusing coil 17 and tracking coil 14 respectively.The 1st magnet 22 is the magnets that focusing coil 17 and tracking coil 14 given driving force.In addition, the 2nd magnet 21 is auxiliary magnets to focusing coil 17 and tilt coil 16 driving forces.
That is, for focusing coil 17, the coil of its Tg direction left and right sides is accepted and the equidirectional driving force of above-below direction simultaneously.In addition, tracking coil 14 too, the coil of its Tg direction left and right sides is accepted and the equidirectional driving force of Tr direction simultaneously.So, tilt coil 16 its Tg direction pair of right and left coils, right and left to, accept the opposite power of mutual direction simultaneously.At this moment, owing to utilize the 2nd magnet 21 direction of the magnetic line of force can be bent towards the trajectory direction outside and the inboard of yoke, coil in the Tr direction outside and inboard also applies the driving force of equidirectional, institute is so that the electromagnetic force increase, because at the medial support hanging metal line 1 of Tr direction, so can improve the acceleration sensitivity of vergence direction.Equally, utilize the configuration of the 2nd magnet 21, also can improve acceleration sensitivity focusing coil 17.
Below, illustrate that damping agent coating position does not need the effect of resonating to what prevent the hanging metal line.
Fig. 8, Fig. 9, and Figure 10 be the figure of the relation of the frequency number at damping agent coating 1/10,1/2,1/3 place, position of respectively presentation graphs 4 and gain and phase place.
As shown in Figure 4, with the 2nd fixed part 12 damping agents 3 inner sides as benchmark, with the position of the position fixed ends A (connection terminal 11) of objective carrier side and about the length between the most inboard position C (fixed position of damping base side) of the hanging metal line 1 of the 3rd fixed part 13 of damping base 10 frequency characteristic during as X analyze respectively.
As shown in Figure 8, damping agent coating position is when the stiff end distance X with respect to the hanging metal line is the X/10 position, about gain is to have produced the unnecessary resonance of representing with A near 200MHz, similarly is to have produced the caused phase place disorder of the unnecessary resonance of representing with B near 200MHz about phase place.Therefore, show and there is no damping.
As shown in Figure 9, damping agent coating position shows that damping is obvious when the stiff end distance X with respect to the hanging metal line is the X/2 position.
Concrete is to show: near the unnecessary resonance effect that produces 200MHz for gain, because of damping does not have to produce, but has produced the non-standard gain of representing with C; For phase place, near the caused phase delay of representing with D identical 60MHz of non-standard gain has very big influence, is difficult to carry out servocontrol.
As shown in figure 10, damping agent coating position is when the stiff end distance X with respect to the hanging metal line is the X/3 position, even for gain, near the unnecessary resonance that produces 200MHz does not have to produce because of the influence of the appropriate damping of show, and, do not produce non-standard gain yet, do not have the influence to phase place of phase place disorder or phase delay etc. fully, show and to carry out servo-controlled characteristic frequency.
This shows, damping agent is applied position configuration in 1/5～2/5 the position of leaving the hanging metal line length from the fixed position of damping base side mounting metal wire, can obtain best effect with the expensive damping agent of a small amount of coating.And why damping agent coating position is that different its dampings of viscosity of damping agent kind are also different in the reason of 1/5～2/5 scope.
As described above, in an embodiment of the present invention, utilization fixes on 1/5～2/5 length place with the coating position of hanging metal line, can prevent unnecessary resonance and non-standard gain, therefore can provide to carry out servocontrol and cheap objective lens device easily.
In addition, in an embodiment of the present invention, CD drive for example is not limited to, the objective lens device of the optical pickup device of CD-ROM, CD ± RW, DVD-ROM, DVD ± R/RW, DVD-RAM, Blu-ray, AOD etc.
Also have,, be not limited to the fine ultra tiny type of half height (Ha one Off Ha イ ト), can also be applicable to that all are installed in the symmetric form (Symmetry) on the driver, the composition lens drive unit of asymmetric (Asymmetry) according to embodiments of the invention.
Claims (4)
1. objective lens device has: the fixing objective carrier of object lens; Be located at the both sides of described objective carrier and an end separately respectively and be fixed on hanging metal line on the 1st fixed part; Leave and be provided with and have the damping base of the 2nd and the 3rd fixed part at another two distolateral places that support described hanging metal line along the 1st direction with described objective carrier, it is characterized in that: the distance between the described the 2nd and the 3rd fixed part is 1/5～2/5 times of distance between the described the 1st and the 3rd fixed part, and is provided with damping agent flexibly to support described hanging metal line on described the 2nd fixed part.
2. objective lens device according to claim 1, it is characterized in that: have the yoke base that supports described objective carrier and described damping base, described objective carrier has tilt coil at 4 places, the focusing coil around it of reeling, be located at tracking coil on the both sides at two ends, the outside of this each coil respectively, at the 1st magnet of each coil that has the described objective carrier of the clamping of being configured on the described yoke base be configured in a pair of the 2nd magnet between a pair of the 1st magnet of described both sides respectively.
3. objective lens device according to claim 2 is characterized in that: described yoke base has 4 the 1st yokes being configured in described each coil, is configured in tabular the 2nd yoke at the two ends, described the 1st direction outside of described the 1st magnet respectively.
4. objective lens device according to claim 2, it is characterized in that: the front end at described tilt coil is connected with the end that lead-in wire bends to L word shape, wall portion is run through near the cavity that is arranged on the described object lens in a described end, after the other end runs through and is fixed in the pickup groove of the substantial middle portion that is located at described damping base, rearward outstanding.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003423278 | 2003-12-19 | ||
| JP2003423278A JP2005182930A (en) | 2003-12-19 | 2003-12-19 | Objective lens driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1629948A true CN1629948A (en) | 2005-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100985211A Pending CN1629948A (en) | 2003-12-19 | 2004-12-09 | Objective lens driving device |
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| Country | Link |
|---|---|
| JP (1) | JP2005182930A (en) |
| KR (1) | KR20050062363A (en) |
| CN (1) | CN1629948A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072962A (en) * | 2016-11-11 | 2018-05-25 | 阿尔卑斯电气株式会社 | Lens driver |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4693510B2 (en) * | 2005-06-08 | 2011-06-01 | 三洋電機株式会社 | Objective lens drive |
| JP4560840B2 (en) * | 2005-12-28 | 2010-10-13 | コニカミノルタオプト株式会社 | Lens drive device |
-
2003
- 2003-12-19 JP JP2003423278A patent/JP2005182930A/en not_active Withdrawn
-
2004
- 2004-11-10 KR KR1020040091179A patent/KR20050062363A/en not_active Application Discontinuation
- 2004-12-09 CN CNA2004100985211A patent/CN1629948A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072962A (en) * | 2016-11-11 | 2018-05-25 | 阿尔卑斯电气株式会社 | Lens driver |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050062363A (en) | 2005-06-23 |
| JP2005182930A (en) | 2005-07-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |